Reducing device for slivers for drawing mechanisms for textile slivers



g- 1932- F. cAsABLAN cAs 1,870,095

REDUCING DEVICE FOR SLIVERS FOR DRAWING MECHANISMS FOR TEXTILE SLIVERS- Filed March 31, 1930 Patented Aug. 2, 1932 UNITED ES PATENT OFFICE FERNANDO OASABLANGAB, OF SABADELL, SPAIN- m REDUCING DEVICE roasmvms 10R DRAWING-MECHANISMS FOB TEXTILE SLIVERS Application fled larch 81, 1980, Serial No. 440,517, and in Spain Apri1 25, 1929.

This invention relates to devices for reducing the width of the sliver, used in mechanisms 'for drawing textile slivers.

These reducing devices are of unquestion- 6 able utility in any drawing mechanisms, but more particularly in those with great single or mu tiple draft where, owing to the action of the latter, the thick sliver introduced into the drawing mechanism, is greatly flattened 10 and has its fibres relatively separated on being delivered to the pair of drawing members, and therefore itis advisable to reduce its width in order to prevent many lateral fibres from deviating and forming Waste 16 which settles on the machine and on the clearing rollers, with the resulting waste and defects' in thethread.

Up to the present these reducing devices have been built in difierent forms whiclf dif- 30 fered from one another chiefly by the method 1n which they were supported or mounted, whilst their own shape is always simply that of a more or less conical or pyramidal funnel. As regards the method of supporting them,

7 various'solutions have been proposed which a may be classified in two groups; the arrangement of the reducing 1 device guided directly or indirectly by the oscillating sliver guide bar, and the arran ement of the reducing device loosely on a xed'rod which supports it and enables the reducer to move so as to follow the lateral reciprocation. of the sliver. In all these systems, the reducing device has, in thedirection of the current of fibres, a position which depends on its supporting mechamsm and which must be arranged'as close as possible. to the pair of drawing rollers in order to ensure an efficient action of the re- "ducing device. This is very diflicult in practice, and when the correct position is obtained, it does not last, since at the slightest deformation of movement of the supporting mechanism, the reducing devices cease to occupy correct posit-ion and no longer work properly.

These drawbacks are absolutely avoided by the present invention according to which the reducing device isperfectly. free without being secured to any guide mechanism and merely rests on the lower drawing roller, the

sliver itself being-the part which moves it in the lateral direction so that it is centered with it by the action of the relative friction. This type of reducin device may be called therefore a floating reducing device since it is not connected to any supporting member but is perfectly free and merely exposed to the action of the sliver which guides it and causes it to slide whilst resting with its bottom face on the lower'drawing roller. Moreover the reducing device according to the invention is always drawn forward by the front air of these rollers and bythe very jet 0 fibres which passes through its interior during the working of the drawing mechanism. In that way, it is ensured that its position in the path of the sliver shall be the most convenient one or that it shall accompany the fibres to the very point of nipping by the pair of drawing rollers,- only a minimum of fibres being allowed to escape. y

In a reducing device of such a construction, it happens that if, when the machine is working, a sliver should break, the lateral movement of the corresponding reducing device will stop, and therefore, on the sliver being threaded in or introduced again, the reducin device which stopped, will no longer coincide with the lateral position of the sliver-so that the latter will not be intro-- duced into the reducer.

In order to avoid this drawback in a practical manner, according to the present invention the reducing devlces are connected together in twos by means of a horizontal couling. In that way, if one of the slivers should break, the corresponding reducing device will not stop its movement of lateral displacement, but on thecontrary the said movement will continue under the action of the ad joining reducing device, and when the broken sliver is introduced again, it will find the reducer in the position which corresponds to the position of the sliver at the moment in question and will automatically pass into the reducer.

l?ractical experience has shown that the couplingfor connecting the reducing devices together in pairs must be an elastic one or, better to say, must all gw of a certain play between the two reducing devices so as to render possible their adaptation to any possible ine ualities in the distance between two holes 0 the sliver guide bar. Moreover, each reducing device must be capable of freely oscillating round the coupling rod in order not to lose its floating or free position.

As during the working ofa spinning machine it is in many cases advisable to remove the top drawing roller without stopping the working of the machine, it is advisable to provide an auxiliary part which may have the shape of a fork which, on the top drawing roller being raised, will hold the two reducin g devices by means of their coupling rod, thus preventing them from dropping on the back of the bottom drawing rollers. This hook or holding part need not be employed in machines such as slubbing frames in-which the top drawing roller is never removed without stopping the machine.

The accompanying drawing illustrates several examples of devices for reducing the width of the fibres, constructed according to the present invention, as well as the application of these reducing devices to mechanisms with great draft:

Figure 1 is a vertical section through the central plane between two adjoining mechanisms, showing the application of the said reducing devices to a mechanism with great draft, with endless belts or hands.

Figure 2 shows in a similar manner the application of the said reducing devices to a mechanism with a great draft in which the holder for the fibres is a set of rollers of small diameter.

. the top and from the front, a set of two reducing devices of open type with their safety fork.

Figure 4 shows in perspective, looking from the right and from the top, a set of two reducing devices of open type.

Figure 5 shows in perspective, looking from the right and from the top, a set of two closed reducing devices for thick slivers.

In Figuresl and 2, M is the sliver which is being drawn,.A are the members for feeding the said sliver, constituted by a pair of rollers a. E are the drawing members which are also constituted by a pair of rollers c, and finally R are generally the holding members which deliver the said sliver direct to the drawing rollers e and at the same time hold it back in order that the fibres seized by the drawing rollers 6, should not pull theother fibres of the sliver which, following the feed movement of'the sliver, have not yet been nipped by the drawing rollers in question. In the construction in Figure 1, the said holding organs are constituted, in a manner already known, by a'pair of endless belts, and in the construction of Figure 2 also in a manner already known, by a pair of rollers of a small diameter arranged very close to the drawing rollers e.-

In either case the sliver reducing device 1 is situated in the usual way between the said holding organs R and the drawing rollers 0.

On examining Figures 3 and 4, it will be possible to understand exactly the constructherefore the latter can slide with a certain play, thus enabling the distance between the two centres of the reducing devices to be.

varied. At the same time, the said recess 31 is sufiiciently large to enable the reducin de vices 1 to turn round the geometrical axls'of the rods 2 and to adapt themselves freely to the front drawing roller not shown in the said Figures 3 and 4.

To prevent the set of the two reducing devices from falling in front of the drawing mechanism when the top drawing roller is withdrawn, there is provided the part 4 in.

the form of a two-pronged fork which rests with its ends 43 on the bottom drawing roller and with its two curved portions 42 on the intermediate bottom roller R. Normally, the

top drawing roller limits the forward position of the reducing devices, and therefore the latter are not held by the fork, but when the top roller is removed, the reducing de- Vices are pulled forward by the movement of the bottom roller and the coupling tube 3 comes in contact with the two branches {l1 bent downwards of the part 4., so that the set of reducing devices 1, rods 2 and sleeve 3 is thus held fast.

In Figure 5 is shown a set of two closed tween centres of the reducing devices, for the purpose of reducing the length of the rods 2.

Both in the construction of Figure 4 and in that of Figure 5, the set of rods 2 and the tube 3 can be mounted within a tube of a larger diameter not shown in the said figures, for the purpose of protecting the coupling mechanism and strengthening the tube 3 weakened by the recesses.

All the reducing devices have their hottom face 11 in the concavo-cylindrical form in order to fit the bottom drawing roller. This is clearly shown in Figures 1 and 2 in which the front bottom roller 6 forms a rest for the reducing devices.

The fork 4 of Figure 3 may be replaced by a similar part made of a plate of brass or other inoxidizable material. When the drawing mechanism is exposed to pressure by means of a tie member passing between the drawing rollers and the holding parts, the said part of stamped out plate must be provided with a central slot at its vfront end in order to allow the tie member to pass.

The material of which these reducing'devices are made, may be any desired, provided that it is hard and inoxidizable and allows the finest possible polishing.

In every casein which a drawing is efiected between the feed members A and the holders B, there may be arranged, also in the same manner as already explained, a reducing device in front of the said holding members which in such a case play also the part of drawing members. In the same way these reducing devices may be used in multiple drawing mechanisms in which various successive drawing operations are eflected, for instance in mechanisms with several pairs of endless belts or of rollers. In such a case a reducing device will be used in front of each pair of members which act as drawing members.

I claim v 1. In a drawing mechanism for textile slivers, drawing cylinders for the slivers, a pair of floating reducers resting upon the lower drawing cylinders, and means for connecting said reducers together to permit the reducers to move toward and away from each other.

2. In a drawing mechanism for textile slivers, drawing cylinders for the slivers, a pair of floating reducers resting upon the lower drawing cylinders, and means for connecting said reducers together to permit the reducers to move toward and away from each other, said reducers having a groove in the upper part thereof to receive the sliver.

3. In a drawing mechanism for textile slivers, drawing cylinders for the slivers, a pair of floating reducers resting upon the lower drawing cylinders, and means for connecting said reducers together to permit the reducers to move toward and away from each other,

and a forked-shaped member for supporting said connecting means when the upper drawing cylinder is removed during the operation oi the mechanism.

In testimony whereof I have signed my name to this specification.

FERNANDO CASABLANGAS. 

